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More than 400 years after Danish astronomer Tycho Brahe challenged established wisdom about the heavens by analyzing a strange new light in the sky, scientists say they've finally nailed down just what he saw.

It's no big surprise. Scientists have known the light came from a supernova, a huge star explosion. But what kind of supernova?

A new study confirms that, as expected, it was the common kind that involves the thermonuclear explosion of a white dwarf star with a nearby companion.

The research, which analyzed a "light echo" from the long-ago event, is presented in Thursday's issue of the journal Nature by scientists in Germany, Japan and the Netherlands.

The story of what's commonly called Tycho's supernova began on Nov. 11, 1572, when Brahe was astonished to see what he thought was a brilliant new star in the constellation Cassiopeia. The light eventually became as bright as Venus and could be seen for two weeks in broad daylight. After 16 months, it disappeared.

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